Epson Stylus Pro 4900/Epson Stylus Pro 4910 Revision A
TROUBLE SHOOTING Remedies for Service Call Error 66
Confidential
1582
ASF Edge Guide
open/close error
ASF Edge Guide is not operating. The operation of the ASF
Edge Guide is not detected.
Connection failure of the EG Sensor.
EG Sensor failure
Edge Release Assy encoder failure
Edge Release Assy failure
1. Check the connection of the EG Sensor (CN220) for
disconnection and damage.
2. Check the connection of the Edge Release Assy (CN218,
CN219) for disconnection and damage.
3. Carry out “Sensor Check” to check if the Edge Sensor
functions normally. (See P.394)
4. Carry out “Encoder Check” to check if the Edge Release
Assy encoder functions normally. (See P.399)
1. Replace the Edge Sensor. (See
P.201)
2. Replace the Edge Release Assy.
(See P.199)
158A
EG Motor
overload error
The electric current flowing when driving the motor is
irregularly large.
Irregular load
Edge Release Assy cable is damaged.
Edge Release Assy encoder failure
Edge Release Assy failure
1. Check the connection of the Edge Release Assy (CN218,
CN219) for disconnection and damage.
2. Carry out “Encoder Check” to check if the Edge Release
Assy encoder functions normally. (See P.399)
Replace the Edge Release Assy.
(See P.199)
158B
EG Motor
over speed error
Detects, when accelerating/decelerating the motor, that it is
being driven at an irregularly faster speed than the specified
value.
Irregular load
Edge Release Assy encoder failure
Edge Release Assy failure
SUB Board is damaged.
Edge Release Assy driver failure
Carry out “Encoder Check” to check if the Edge Release Assy
encoder functions normally. (See P.399)
1. Replace the Edge Release Assy.
(See P.199)
2. Replace the SUB-B Board. (See
P.162)
3. Replace the Main Board. (See
P.152)
158C
EG Motor
reversing error
Detects accumulatively more than the specified number of
times that it is being driven in the opposite direction to the
specified driving direction.
The polarity of Edge Release Assy cable is opposite.
Edge Release Assy encoder failure
1. Check the connection of the Edge Release Assy (CN218,
CN219) for disconnection and wrong installation.
2. Carry out “Encoder Check” to check if the Edge Release
Assy encoder functions normally. (See P.399)
Replace the Edge Release Assy.
(See P.199)
158D
EG Motor
driving time-out error
Detects that the driving period is irregularly long.
Irregular load
Firmware becomes out of control.
---
Replace the Main Board. (See
P.152)
158E
EG Motor
velocity deviation error
Detects, when accelerating/decelerating the motor, that it is
being driven at an irregularly faster speed than the specified
value.
Irregular load
Edge Release Assy encoder failure
Edge Release Assy failure
SUB Board is damaged.
Edge Release Assy driver failure
Carry out “Encoder Check” to check if the Edge Release Assy
encoder functions normally. (See P.399)
1. Replace the Edge Release Assy.
(See P.199)
2. Replace the SUB-B Board. (See
P.162)
3. Replace the Main Board. (See
P.152)
Code Error Name Cause Check Item Remedy
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